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Expired
Application number
GB34919/35A
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Johnson Laboratories Inc
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Johnson Laboratories Inc
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Publication date
Application filed by Johnson Laboratories IncfiledCriticalJohnson Laboratories Inc
Publication of GB467637ApublicationCriticalpatent/GB467637A/en
H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
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Abstract
467,637. High - frequency transformers. JOHNSON LABORATORIES, Inc. Dec. 16, 1935, No. 34919. Convention date, June 26. [Class 38 (ii)] [Also in Group XL] A permeability tuned high-frequency system for wireless reception comprises two resonant circuits gang tuned and coupled together by the capacity coupling between the tuning coils and their cores so that tuning to a lower frequency tightens the capacitive coupling between the circuits. The cores are connected together and may be earthed through a condenser 11 or through a series or parallel resonant circuit for the purpose of varying the coupling for a desired portion of the frequency range. The resonant circuits may additionally as shown be coupled by a common fixed condenser 25, or by a condenser connected between the top ends of the coils. The resonant circuits are preferably so designed as to have a constant inductance to resistance ratio but deviations may be compensated by varying the coupling between the circuits.
GB34919/35A1935-06-261935-12-16Improvements in coupling means for permeability tuned circuits for wireless reception
ExpiredGB467637A
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